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Wisconsin Journeyman Plumber – Restricted Appliance Practice
Exam 2026-2027 BANK QUESTIONS WITH DETAILED
VERIFIED ANSWERS EXAM QUESTIONS WILL COME
FROM HERE (100% CORRECT ANSWERS A+ GRADED
1. According to the Wisconsin Plumbing Code, what is the minimum
allowable distance between a gas appliance vent termination and a
mechanical air intake?
A. 1 foot
B. 3 feet
C. 5 feet
D. 10 feet
Answer: B. 3 feet. The code requires a minimum of 3 feet clearance to
prevent combustion byproducts from re-entering the building.
2. What is the maximum allowable length of a flexible gas appliance
connector used for a residential water heater?
A. 2 feet
B. 3 feet
C. 6 feet
D. 10 feet
Answer: C. 6 feet. The Wisconsin code limits appliance connectors to 6
feet maximum to reduce the risk of damage and leaks.
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3. When pressure testing a new gas piping system serving appliances at
1/2 psig, what must the test gauge be capable of reading?
A. A minimum of 20 psi
B. Up to 10 psi in 0.25 psi increments
C. The test pressure accurately with a range such that the test pressure
falls at the midpoint of the gauge
D. Full scale vacuum to 15 psi
Answer: C. The test pressure accurately with a range such that the test
pressure falls at the midpoint of the gauge. This ensures accuracy and
safety during the test procedure.
4. What is the primary reason a water heater temperature and pressure
(T&P) relief valve must not be directly piped to a drain?
A. It causes water hammer.
B. It prevents visual observation of discharge.
C. It cools the valve, preventing it from opening.
D. It violates backflow prevention rules.
Answer: B. It prevents visual observation of discharge. The code
requires an air gap and a visible discharge point so any leakage or relief
activity is immediately obvious.
5. A Category I gas appliance vent connector must have a minimum
upward slope toward the vent of at least how much per foot?
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A. 1/8 inch
B. 1/4 inch
C. 1/2 inch
D. 1 inch
Answer: B. 1/4 inch. The 1/4 inch per foot slope ensures proper draft
and condensate drainage in the correct direction.
6. What material is prohibited for gas piping downstream of a natural
gas meter in Wisconsin?
A. Schedule 40 steel
B. Type L copper
C. Cast iron
D. CSST with a yellow jacket
Answer: C. Cast iron. Cast iron is brittle and not permitted for gas
piping; only approved materials like steel, copper, or CSST may be used.
7. The minimum unobstructed working space in front of a furnace
service panel should be at least how wide?
A. The width of the appliance
B. 30 inches
C. 24 inches
D. 12 inches
, 4|Page
Answer: B. 30 inches. The 30-inch width, extending from the floor to
the height of the appliance, ensures safe access for servicing.
8. What is the maximum allowable supply gas pressure to a residential
appliance, unless a regulator is installed at the appliance?
A. 5 psig
B. 2 psig
C. 1/2 psig
D. 14 inches water column
Answer: D. 14 inches water column, which is roughly equivalent to 1/2
psig. Most residential appliances are designed for this standard inlet
pressure.
9. A gas clothes dryer exhaust duct shall be constructed of what
minimum thickness of aluminum?
A. 0.010 inch
B. 0.016 inch
C. 0.025 inch
D. 0.032 inch
Answer: B. 0.016 inch. This minimum thickness provides sufficient
rigidity and fire resistance for the exhaust duct.
10. At what height above the floor must a gas appliance, installed in a
residential garage without a stand, have its ignition source located?
Wisconsin Journeyman Plumber – Restricted Appliance Practice
Exam 2026-2027 BANK QUESTIONS WITH DETAILED
VERIFIED ANSWERS EXAM QUESTIONS WILL COME
FROM HERE (100% CORRECT ANSWERS A+ GRADED
1. According to the Wisconsin Plumbing Code, what is the minimum
allowable distance between a gas appliance vent termination and a
mechanical air intake?
A. 1 foot
B. 3 feet
C. 5 feet
D. 10 feet
Answer: B. 3 feet. The code requires a minimum of 3 feet clearance to
prevent combustion byproducts from re-entering the building.
2. What is the maximum allowable length of a flexible gas appliance
connector used for a residential water heater?
A. 2 feet
B. 3 feet
C. 6 feet
D. 10 feet
Answer: C. 6 feet. The Wisconsin code limits appliance connectors to 6
feet maximum to reduce the risk of damage and leaks.
,2|Page
3. When pressure testing a new gas piping system serving appliances at
1/2 psig, what must the test gauge be capable of reading?
A. A minimum of 20 psi
B. Up to 10 psi in 0.25 psi increments
C. The test pressure accurately with a range such that the test pressure
falls at the midpoint of the gauge
D. Full scale vacuum to 15 psi
Answer: C. The test pressure accurately with a range such that the test
pressure falls at the midpoint of the gauge. This ensures accuracy and
safety during the test procedure.
4. What is the primary reason a water heater temperature and pressure
(T&P) relief valve must not be directly piped to a drain?
A. It causes water hammer.
B. It prevents visual observation of discharge.
C. It cools the valve, preventing it from opening.
D. It violates backflow prevention rules.
Answer: B. It prevents visual observation of discharge. The code
requires an air gap and a visible discharge point so any leakage or relief
activity is immediately obvious.
5. A Category I gas appliance vent connector must have a minimum
upward slope toward the vent of at least how much per foot?
,3|Page
A. 1/8 inch
B. 1/4 inch
C. 1/2 inch
D. 1 inch
Answer: B. 1/4 inch. The 1/4 inch per foot slope ensures proper draft
and condensate drainage in the correct direction.
6. What material is prohibited for gas piping downstream of a natural
gas meter in Wisconsin?
A. Schedule 40 steel
B. Type L copper
C. Cast iron
D. CSST with a yellow jacket
Answer: C. Cast iron. Cast iron is brittle and not permitted for gas
piping; only approved materials like steel, copper, or CSST may be used.
7. The minimum unobstructed working space in front of a furnace
service panel should be at least how wide?
A. The width of the appliance
B. 30 inches
C. 24 inches
D. 12 inches
, 4|Page
Answer: B. 30 inches. The 30-inch width, extending from the floor to
the height of the appliance, ensures safe access for servicing.
8. What is the maximum allowable supply gas pressure to a residential
appliance, unless a regulator is installed at the appliance?
A. 5 psig
B. 2 psig
C. 1/2 psig
D. 14 inches water column
Answer: D. 14 inches water column, which is roughly equivalent to 1/2
psig. Most residential appliances are designed for this standard inlet
pressure.
9. A gas clothes dryer exhaust duct shall be constructed of what
minimum thickness of aluminum?
A. 0.010 inch
B. 0.016 inch
C. 0.025 inch
D. 0.032 inch
Answer: B. 0.016 inch. This minimum thickness provides sufficient
rigidity and fire resistance for the exhaust duct.
10. At what height above the floor must a gas appliance, installed in a
residential garage without a stand, have its ignition source located?
